When I try to update my Ubuntu 10.04 installation to 10.10 I get the following error.

Could not calculate the upgrade
An unresolvable problem occurred while calculating the upgrade:
Trying to install blacklisted version 'blcr-dkms_0.8.2-13'
This can be caused by:
* Upgrading to a pre-release version of Ubuntu
* Running the current pre-release version of Ubuntu
* Unofficial software packages not provided by Ubuntu
If none of this applies, then please report this bug against the 'update-manager' package and include the files in /var/log/dist-upgrade/ in the bug report.

5 Answers
5

Look with aptitude why blcr-dkms why the package is installed, and remove that package if possible. For me, this was the package r-cran-rmpi which I actually don't use but installed with a apt-get install r-cran-* command.

Don't forget to do a apt-get autoremove to really uninstall the blcr-dkms package automatically.